Cap of my already rc done tooth is broken and needs replacement. Also gap is formed to adjacent tooth .do I have to do rc again .also should I see mds doctor. Tooth is lower one last but one.

As long as root is intact and broken part of tooth has not involved the canal system of the tooth, any dentist will do the needful. Specialist is needed when prognosis is poor. Sometimes only option remains is extraction of the tooth, that also any dentist will do. So you decide accordingly.
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